1.- a live preview is almost imposible because the script has to change the hue saturation and lighting of the images. If you run the project and created a new theme you must have seen the log of the script and it says you it makes 182 new gif's and other png's so if i am going to get it live when someone move the hue one by one i will have to regenerate all the images and the colors of the theme to make that available so if you move hue by 1 you then have to wait like 60-120 secs to get the preview (maybe more depends on how is the current cpu charge on my server). But i am thinking on making another aproach to this and maybe in the future i can have it done (i will try to make an small file with only (lets say) the window control, to make the live preview), thanks for sharing your notes though to make me think on it.
2.- why you want to change to RGB? to change color by color of the file? that would be in a future version of the tool. (Maybe a too far future)